Refactor the ViewElement calls into the VIew
Add Stereo Interface to view
Move Stereo Functionality from OsgView into View
Serialization support in View

Does not complete serialization just add most of the enabling properties, refactor some setters
Fix linux crash due to deallaction order with keyboard and mouse handler in static scope
Fix ApplicationData using "config.txt" in Physics RenderTest and UnitTest
StaplingExample's ApplicationData use config file.
Merge branch 'fix/staplingexample-config' into 'master'

ApplicationData in StaplingExample all use the config file.

+1: Harald Scheirich

Merged-on: https://www.assembla.com/code/OpenSurgSim/git/merge_requests/894753
Merge branch 'fix/physicsRenderTestApplicationData' into 'master'

Fix ApplicationData using 'config.txt' in Physics Render/Unit Test

+1: haizhouW, Harald Scheirich

Merged-on: https://www.assembla.com/code/OpenSurgSim/git/merge_requests/891673
Merge branch 'master' into feature/add-stereo-view

Conflicts:
	SurgSim/Graphics/RenderTests/RenderTest.cpp
Merge branch 'feature/add-stereo-view' into 'master'

Add stereo capabilites to view

Merged-on: https://www.assembla.com/code/OpenSurgSim/git/merge_requests/870193